Abstract
Tropical Agricultural Research and Extension is a peer-reviewed international scientific journal covering a wide range of subject areas in tropical and subtropical agriculture published quarterly by the Faculty of Agriculture, University of Ruhuna, Sri Lanka. The journal is also available on the Faculty of Agriculture, University of Ruhuna website https://www.agri.ruh.ac.lk/tare/index.htm .
Highlights
Adequate supplies of nutrients for rice crops play a major role in realizing the yield potential
TGM values increased from heading until the 32nd day irrespective of the nitrogen levels or varieties (Table 2)
After 12 days of heading significant increase of grain filling rate was observed in high N treatments (≥100kg N ha-1) and both varieties showed the same pattern of increase in grain filling rate within different N levels (Figure 1)
Summary
Adequate supplies of nutrients for rice crops play a major role in realizing the yield potential. The profitability of intensive rice production depends on fertilizer application (Yoseftabar 2013). Nitrogen (N) is required in comparatively greater quantities than other essential nutrients. Nitrogen plays a vital role in the growth and the yield of crops. Apart from being a part of proteins, N is an essential component of chlorophyll; a chemical crucial for the life-sustaining process, photosynthesis. Qiao-gang et al (2013) reported that deficiency of soil nitrogen is one of the main limiting factors for achieving high rice yield.
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